package com.cr.common.utils.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.cr.common.constant.Constants;
import com.cr.common.utils.StringUtils;
import org.springframework.http.MediaType;

/**
 * 通用http发送方法
 * 
 * @author cr
 */
public class HttpUtils
{
    private static final Logger log = LoggerFactory.getLogger(HttpUtils.class);

    /** 连接重试次数 */
    private static final int CONNECT_RETRY_TIMES = 10;

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url 发送请求的 URL
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url)
    {
        return sendGet(url, StringUtils.EMPTY);
    }

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param)
    {
        return sendGet(url, param, Constants.UTF8);
    }

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param contentType 编码类型
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param, String contentType)
    {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try
        {
            String urlNameString = StringUtils.isNotBlank(param) ? url + "?" + param : url;
            log.info("sendGet - {}", urlNameString);
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
            String line;
            while ((line = in.readLine()) != null)
            {
                result.append(line);
            }
            log.info("recv - {}", result);
        }
        catch (ConnectException e)
        {
            log.error("调用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e);
        }
        catch (SocketTimeoutException e)
        {
            log.error("调用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e);
        }
        catch (IOException e)
        {
            log.error("调用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e);
        }
        catch (Exception e)
        {
            log.error("调用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e);
        }
        finally
        {
            try
            {
                if (in != null)
                {
                    in.close();
                }
            }
            catch (Exception ex)
            {
                log.error("调用in.close Exception, url=" + url + ",param=" + param, ex);
            }
        }
        return result.toString();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param)
    {
        return sendPost(url, param, MediaType.APPLICATION_FORM_URLENCODED_VALUE);
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url 发送请求的 URL
     * @param param 请求参数
     * @param contentType 内容类型
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param, String contentType)
    {
        // 重试次数
        int tries = 0;
        // 重试等待时间（毫秒数）
        long waitMills = 10000;
        // 是否成功
        boolean success = false;

        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        while (tries < CONNECT_RETRY_TIMES && ! success) {
            try {
                log.info("Post请求第{}次, url={}, param = {}",(tries + 1), url, param);
                URL realUrl = new URL(url);
                URLConnection conn = realUrl.openConnection();
                conn.setRequestProperty("accept", "*/*");
                conn.setRequestProperty("connection", "Keep-Alive");
                conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
                conn.setRequestProperty("Accept-Charset", "utf-8");
                conn.setRequestProperty("Content-Type", contentType);
                conn.setConnectTimeout(30000);
                conn.setReadTimeout(30000);
                conn.setDoOutput(true);
                conn.setDoInput(true);
                out = new PrintWriter(conn.getOutputStream());
                out.print(param);
                out.flush();
                in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
                String line;
                while ((line = in.readLine()) != null)
                {
                    result.append(line);
                }
                success = true;
//                log.info("recv - {}", result);
            }
            catch (ConnectException e)
            {
                tries ++;
                log.error("调用HttpUtils.sendPost ConnectException, url={},param={}", url, param, e);
            }
            catch (SocketTimeoutException e)
            {
                tries ++;
                log.error("调用HttpUtils.sendPost SocketTimeoutException, url={},param={}", url, param, e);
            }
            catch (IOException e)
            {
                tries ++;
                log.error("调用HttpUtils.sendPost IOException, url={},param={}", url, param, e);
            }
            catch (Exception e)
            {
                tries ++;
                log.error("调用HttpsUtil.sendPost Exception, url={},param={}", url, param, e);
            }
            finally
            {
                try
                {
                    if (out != null)
                    {
                        out.close();
                    }
                    if (in != null)
                    {
                        in.close();
                    }
                }
                catch (IOException ex)
                {
                    log.error("调用in.close Exception, url={},param={}", url, param, ex);
                }

                if(tries > 0 && !success) {
                    log.info("Retry loading…");
                    try {
                        Thread.sleep(waitMills);
                        // 每次重试等待时间增加1秒
                        waitMills += 1000;
                    } catch (InterruptedException e) {
                        log.error("InterruptedException", e);
                    }
                }
            }
        }

        if (! success) {
            log.error("Failed after {} retries.", CONNECT_RETRY_TIMES);
        }
        return result.toString();
    }

    public static String sendSSLPost(String url, String param)
    {
        return sendSSLPost(url, param, MediaType.APPLICATION_FORM_URLENCODED_VALUE);
    }

    public static String sendSSLPost(String url, String param, String contentType)
    {
        StringBuilder result = new StringBuilder();
        String urlNameString = url + "?" + param;
        try
        {
            log.info("sendSSLPost - {}", urlNameString);
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[] { new TrustAnyTrustManager() }, new java.security.SecureRandom());
            URL console = new URL(urlNameString);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
            conn.setRequestProperty("Accept-Charset", "utf-8");
            conn.setRequestProperty("Content-Type", contentType);
            conn.setDoOutput(true);
            conn.setDoInput(true);

            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.connect();
            InputStream is = conn.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String ret = "";
            while ((ret = br.readLine()) != null)
            {
                if (ret != null && !"".equals(ret.trim()))
                {
                    result.append(new String(ret.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8));
                }
            }
            log.info("recv - {}", result);
            conn.disconnect();
            br.close();
        }
        catch (ConnectException e)
        {
            log.error("调用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e);
        }
        catch (SocketTimeoutException e)
        {
            log.error("调用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e);
        }
        catch (IOException e)
        {
            log.error("调用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e);
        }
        catch (Exception e)
        {
            log.error("调用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e);
        }
        return result.toString();
    }

    private static class TrustAnyTrustManager implements X509TrustManager
    {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType)
        {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType)
        {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers()
        {
            return new X509Certificate[] {};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier
    {
        @Override
        public boolean verify(String hostname, SSLSession session)
        {
            return true;
        }
    }
}